TAILIEUCHUNG - Role of calculation model in experimentally determining thermal energy generated in laser rod of solid laser

In many solid-state laser pumped by flash lamps, thermal source distributed in laser rod is heterogeneous, complicated and cannot be described by explicit functions. Pumping process can be considered an adiabatic process. Thermal gradient generated within the laser rod is the result of the inhomogeneous distribution of absorbed energy. Calculation model and numerical method can help to determine the relation between the experimental values and thermal energy generated in laser rod. | Communications in Physics, Vol. 24, No. 3 (2014), pp. 239-245 DOI: ROLE OF CALCULATION MODEL IN EXPERIMENTALLY DETERMINING THERMAL ENERGY GENERATED IN LASER ROD OF SOLID LASER PHAM VU THINH AND LE NGOC ANH Institute of Technical Physics, Military Institute of Science and Technology E-mail: ngocanhle74@ Received 25 April 2014 Accepted for publication 26 Agust 2014 Abstract. In many solid-state laser pumped by flash lamps, thermal source distributed in laser rod is heterogeneous, complicated and cannot be described by explicit functions. Pumping process can be considered an adiabatic process. Thermal gradient generated within the laser rod is the result of the inhomogeneous distribution of absorbed energy. Calculation model and numerical method can help to determine the relation between the experimental values and thermal energy generated in laser rod. Keywords: solid-state laser, lase rod. I. INTRODUCTION In a solid-state laser, a significant fraction of absorbed pump radiation is converted into heat instead of contributing to laser radiation [1]. In flashlamp-pumped system, the broad spectral distribution of the pump source causes a significant amount of generated heat. For high repetition rate and high power lasers, thermal effects should be mitigated because these effects may reduce remarkably laser beam quality, interfere with efficient laser operations. Thermal stresses may cause some thermal fracture damages on the laser rod. For this reason, one of the most critical problems in designing, manufacturing a high repetition rate and high power laser system is to address heat dissipation issue. In order to solve the thermo physics problem of the laser rod, we need to determine the generated thermal energy and its distribution within pumped laser rod. II. EXPERIMENTAL CAPABILITIES Direct measurement of generated thermal energy in laser rod is a complicated problem and technically unfeasible, especially when the pulse width is

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• Communications in Physics
• Calculation model in experimentally determining thermal energy generated
• Laser rod of solid laser
• Flashlamp pumped system
• Thermal energy generated
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